$ git clone -n https://src.fedoraproject.org/rpms/R-R6.git /var/lib/mock/f40-build-2270317-54804/root/chroot_tmpdir/scmroot/R-R6
Cloning into '/var/lib/mock/f40-build-2270317-54804/root/chroot_tmpdir/scmroot/R-R6'...
$ git fetch origin 31e82a489d3e67a044bf9f6bc7b94c11a2c7a543:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-R6
 * [new ref]         31e82a489d3e67a044bf9f6bc7b94c11a2c7a543 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 31e82a4 Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild